The legacy of a development finance business that the bank regards as non-core continues to mess with bad debt metrics at Suncorp Metway.Suncorp said its level of impaired loans increased 19 per cent to $1.75 billion over the three months to September 2009. Loans 90 days or more past due increased four per cent to $449 million.Almost all this increase was in the category of loans now classed as "non-core", and which includes some corporate loans as well as those advanced to larger property developers.The core retail banking franchise is travelling pretty well, as the easier borrowing conditions fuelled by the fiscal and monetary stimulus of the last year saw the level of home loan arrears fall by half.Suncorp yesterday held a conference call for investors and media to elaborate on its third-quarter asset quality data.The new chief executive, Patrick Snowball, used the briefing to elaborate on some themes covered at the recent annual meeting, including the prospect of meaningful savings by a revised approach to managing the information technology needs of the businesses.He cited multiple insurance claims handling systems and insurance pricing systems as areas ripe for savings.Suncorp also clarified its approach to the management of the commercial insurance business, announcing a series of appointments under the newly titled CEO Commercial Insurance, Anthony Day.Commercial insurance lines will be separated from statutory insurance lines such as third party motor and workers' compensation.